EP1106629B1 - Verfahren und Detektor zur Bestimmung und Messung von Agglomeraten - Google Patents

Verfahren und Detektor zur Bestimmung und Messung von Agglomeraten Download PDF

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Publication number
EP1106629B1
EP1106629B1 EP00304449A EP00304449A EP1106629B1 EP 1106629 B1 EP1106629 B1 EP 1106629B1 EP 00304449 A EP00304449 A EP 00304449A EP 00304449 A EP00304449 A EP 00304449A EP 1106629 B1 EP1106629 B1 EP 1106629B1
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EP
European Patent Office
Prior art keywords
detecting
container
agglomerates
detecting rod
mixed phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00304449A
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English (en)
French (fr)
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EP1106629A1 (de
Inventor
Koji Takimiya
Tsutomu Konaka
Mitsuru Tamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Chemical Co Ltd
Original Assignee
Sumitomo Chemical Co Ltd
Sumitomo Metal Industries Ltd
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Publication of EP1106629A1 publication Critical patent/EP1106629A1/de
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1809—Controlling processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00654—Controlling the process by measures relating to the particulate material
    • B01J2208/00681—Agglomeration

Definitions

  • the present invention relates to a method and apparatus for detecting agglomerates formed in a mixed phase container such as a fluidized-bed olefin polymerization reactor container, and to a method and apparatus for fluidized-bed olefin polymerization.
  • a method of radiation is being used for detecting agglomerates formed in a mixed phase container, such as a fluidized-bed olefin polymerization reactor container (refer to Japanese Patent Publication No.62-28961).
  • a radiation source is placed in the center of the container and a plurality of radiation detectors are disposed around the container.
  • the detectors detect density fluctuations in the mixed phase between the radiation source and the detectors by using the radiation.
  • Another method for detecting agglomerates in the mixed phase container employs an electrostatic capacitance detecting method.
  • Means for detecting electrostatic capacitance is disposed on the inner wall of the mixed phase container. This method is based on detecting fluctuations of electrostatic capacitance, since the density (dielectric constant) of agglomerates is greater than that of the mixed phase.
  • the detecting means detects fluctuations in the electrostatic capacitance thereof. Therefore, the detecting means is able to monitor the state of agglomerates by measuring the amount of fluctuations in electrostatic capacitance.
  • another method for detecting agglomerates employs a detecting rod having a strain detecting means in the mixed phase container, as shown in Japanese Laid-open Patent Publication No.10-36447. According to this method, it is possible to detect the existence and the size of agglomerates formed in the mixed phase container by detecting an amount of the strain generated in the detecting rod when agglomerates collide with the detecting rod. Accordingly, the detecting rod having strain gauges is disposed in the mixed phase container and measures the strain in the detecting rod by collision of agglomerates to detect the existence and the size of agglomerates.
  • a fluidized-bed olefin polymerization reactor container is generally an enormous container of roughly cylindrical shape having a diameter of several meters and a height of several tens of meters.
  • a worker must enter the container to remove the blockage when blockage occurs, or to perform the inspections at periodic inspections. Accordingly, since a radiation source is present in the container, sufficient considerations must be made to ensure the safety of workers performing such operations.
  • the method employing an electrostatic capacitance detecting means to detect agglomerates is suitable for detecting agglomerates adhered to the inner walls of the container and has no problem related to safety, the method is not sufficiently precise for detecting agglomerates which are moving within the container. Further, since the difference between the density of small agglomerates and that of normal olefin polymer product is small, this method is not sufficient even for detecting agglomerates adhered to the inner walls of the container.
  • the method of detecting agglomerates using a strain detecting device does not have the problems described above. However, in this method, it is essential that the agglomerates effectively collide with the detecting rod. Since the agglomerates formed in the container move along with the flow of gas and powders such as products of the olefin polymer and/or catalysts in the mixed phase, it is necessary to know beforehand how gas and powders in the mixed phase will flow. Or else, agglomerates will not collide with the detecting rod with an effective force, thereby greatly lowering the sensitivity of detection.
  • strain gauges are proportional to the amount of strain in the detecting rod. Accordingly, collisions by small agglomerates will only cause slight fluctuations in the measured value, which is not enough to be detected. Hence, this method is not sufficiently sensitive for detecting agglomerates weighing 500 grams or less.
  • agglomerates In the case of large agglomerates, agglomerates occasionally accumulate on the part of the detecting rod facing with the flow. If agglomerates accumulate on the detecting rod when using strain gauges, the strain in the detecting rod will remain and the detecting rod will continue to output signals, effectively preventing detection of newly generated agglomerates or variations in the mixed phase.
  • the present invention has been made in view of the above drawbacks. It is an object of the present invention to provide a safe method and apparatus capable of detecting even small agglomerates with a high degree of precision and sensitivity. It is another object of the present invention to provide a method and apparatus for fluidized-bed olefin polymerization.
  • a method for detecting agglomerates in a mixed phase container in which a mixed phase of gas and powders is formed comprising: disposing a detecting rod with one end projecting freely into the container and the other end projecting freely at outside of the container, a portion of the detecting rod being fixed to the container; mounting a magnet on a free end of the detecting rod at outside of the container, the magnet being movable; and detecting magnetic flux fluctuations by movement of the magnet so as to measure an existence of the agglomerates.
  • This method enables the detection of agglomerates formed in the mixed phase container based on a value proportional to the moving velocity of the permanent magnets in association with the collision of agglomerates.
  • an apparatus for detecting agglomerates in a mixed phase container in which a mixed phase of gas and powders is formed comprising: a detecting rod disposed with one end projecting freely into the container and the other end projecting freely at outside of the container, a portion of the detecting rod being fixed to the container; a magnet mounted on the free end of the detecting rod and movable about a point of the detecting rod as a fulcrum; and a magnetic flux detecting means for detecting fluctuations produced by movement of the magnet.
  • Part of the detecting rod is inserted in a protecting tube which is freely projecting into the container.
  • a distributor plate specially designed to swirl gas and powders above the plate (referred to as “distributor plate” hereinafter) is disposed on the bottom of the mixed phase container for diffusing the gas in a horizontal direction, and the detecting rod is positioned at a predetermined height above the distributor plate.
  • This method can control the flow of gas and powders within the mixed phase container, thereby effectively forcing the agglomerates to collide with the detecting rod.
  • a fluidized-bed olefin polymerization reactor wherein a mixed phase of gas and powders is formed, the reactor having an apparatus for detecting agglomerates as described above.
  • an olefin polymerization method comprising a method for detecting agglomerates as described above.
  • a method for manufacturing an olefin polymer comprising a method for detecting agglomerates as described above.
  • a fluidized-bed olefin polymerization reactor container is used as a mixed phase container.
  • FIG. 1 is a schematic diagram showing a fluidized-bed olefin polymerization reactor container and its peripheral pipelines.
  • a mixed phase of gas and powders is formed and fluidized in a fluidized-bed olefin polymerization reactor container 1, which serves as a mixed phase container.
  • a polymerization reaction occurs in such a state.
  • the pressure in the fluidized-bed olefin polymerization reactor container 1 is approximately in the range from 1 to 3 MPa and the temperature approximately in the range from 70 to 100 °C.
  • a catalyst and an olefin gas such as ethylene gas are supplied through an inlet 4 into the fluidized-bed olefin polymerization reactor container 1.
  • a circulating gas constantly circulates via a gas line 7 by a circulating gas compressor 5.
  • a heat exchanger 6 is provided along the path of the circulating gas for adjusting the temperature of the circulating gas.
  • a polymerization reaction occurred in the fluidized-bed olefin polymerization reactor container 1 generates such products as powdered polyethylene, polypropylene, or the like. These products pass through a discharge valve 8 and a discharge line 9 into a primary silo 10, in which the products are stored temporarily. The products are distributed into nitorogen-compressor line 13 by a rotary valve 11 and delivered to a desired location by wind-force of nitorogen-compressor blower 12.
  • FIG. 2 is an enlarged diagram showing the lower portion of the fluidized-bed olefin polymerization reactor container 1 with part of the container 1 cut out to illustrate its internal construction.
  • the circulating gas supplied from the lower portion of the fluidized-bed olefin polymerization reactor container 1 flows upward from a plurality of opening holes 21 formed on the distributor plate 2 to form a mixed phase of gas and powders in the fluidized-bed olefin polymerization reactor container 1, in which a polymerization reaction occurs.
  • agglomerates 20 are formed in nodules due to variations in the state of the mixed phase.
  • the process of this formation of agglomerates is not completely elucidated yet.
  • agglomerates 20 While the formed agglomerates 20 remain small, agglomerates circulate in the mixed phase in the floating state along with the flow of powders in the mixed phase. As the agglomerates 20 grow larger, however, agglomerates are no longer fluidized together with the powders and begin to settle in the mixed phase. Such agglomerates 20 generally accumulate near the distributor plate or else move irregularly due to the force of the circulating gas diffused from the opening holes on the distributor plate.
  • the opening holes 21 through which the gas is diffused are formed in concentric circles on the distributor plate 2, and streamlined caps 22 are disposed on top of the opening holes 21.
  • the gas is diffused in a horizontal direction from the opening holes 21 on the distributor plate 2.
  • the gas flows in the counterclockwise direction.
  • the large agglomerates described above can be moved in a specific circular direction (counterclockwise in FIG. 3) along the gas flow over the distributor plate 2.
  • the behavior of agglomerates within the mixed phase is dependent not only on the size of the agglomerates but also on operating conditions, such as rate of gas flow, it is possible to move even large agglomerates with a high rate of gas flow.
  • a detecting rod 60 is disposed inside the fluidized-bed olefin polymerization reactor container 1, and comprises a device for detecting agglomerates 20 formed by the adherence of each olefin polymer.
  • the detecting rod 60 will be described below in detail.
  • FIG. 4 is a cross-sectional view showing the internal structure of the detecting rod 60 and the protecting tube 51.
  • FIG. 5 is an enlarged cross-sectional view taken along a line A-A in FIG. 4.
  • the protecting tube 51 is supported like a cantilever with one end fixed to the side wall of the fluidized-bed olefin polymerization reactor container 1 and the other projecting freely into the reactor container 1.
  • the protecting tube 51 is disposed at a predetermined height above the distributor plate 2.
  • the protecting tube 51 is formed of stainless steel in the shape of a hollow cylinder.
  • the detecting rod 60 is essentially housed within the protecting tube 51.
  • the protecting tube 51 comprises a fixed portion 52 having a large diameter (e.g. an outer diameter of 48 mm and inner diameter of 15 mm) and a projecting portion 53 having a small diameter (e.g. an outer diameter of 22 mm and inner diameter of 12 mm).
  • the fixed portion 52 of the protecting tube 51 penetrates the side wall of the fluidized-bed olefin polymerization reactor container 1 and is fixed to the fluidized-bed olefin polymerization reactor container 1 by a flange 54.
  • the projecting portion 53 of the protecting tube 51 projects into the fluidized-bed olefin polymerization reactor container 1.
  • agglomerates 20 formed in the reactor container 1 are moved by the circulating flow and collide with the protecting tube 51, causing the protecting tube 51 to be deflected in the direction of the collision.
  • the detecting rod 60 is inserted into the protecting tube 51 and spans nearly the entire length of the protecting tube 51.
  • One end of the detecting rod 60 (the end on the projecting portion 53 of the protecting tube 51) is fixed to the protecting tube 51 by being screwed at two points F1 and F2 shown in FIG. 4.
  • the other end of the detecting rod 60 is free. Accordingly, the detecting rod 60 is fixed to the protecting tube 51 and supported like a cantilever.
  • the outer diameter of the detecting rod 60 (e.g. 10 mm) is smaller than the inner diameter of the fixed portion 52 of the protecting tube 51 and the projecting portion 53, thereby forming a space between the detecting rod 60 and the protecting tube 51. Accordingly, in association with movement (deflection) of the projecting portion 53 of the protecting tube 51, the detecting rod 60 moves within this space about the fastening point F1 as a fulcrum.
  • two cylindrically shaped permanent magnets 61 are mounted perpendicular to each other on the free end of the detecting rod 60.
  • the permanent magnets 61 are housed in a chamber 55 provided in the base of the protecting tube 51.
  • Coils 70 as magnetic flux detecting means are provided on the left and bottom surfaces of the chamber 55 (based on the view shown in FIG. 5), corresponding to the positions of the permanent magnets 61. Specifically, the coils 70 are provided such that the axes of the coils 70 approximately coincide with the axes of the permanent magnets 61. In the present embodiment, the permanent magnets 61 and coils 70 are disposed such that the ends of the permanent magnets 61 are inserted into the centers of the coils 70 in their normal states.
  • the protecting tube 51 and the detecting rod 60 fixed to the protecting tube 51 are deflected in the direction of collision, and the detecting rod 60 moves within the space between the detecting rod 60 and protecting tube 51. Consequently, the permanent magnets 61 mounted on the detecting rod 60 also move in association with the detecting rod 60. Movement of the permanent magnets 61 fluctuates the magnetic flux inside the corresponding coils 70.
  • the coils 70 as magnetic flux detecting means detect the fluctuations in magnetic flux to detect the existence of agglomerates 20 in the container.
  • Output signals from each of the magnetic flux detecting means are inputted via a cable 16 into a converter 17 and converted to the current signals ranging from 4 to 20 mA thereby.
  • the signals are transferred via a cable 18 into a recording warning device 19 to be monitored.
  • the pairs of permanent magnets 61 and coils 70 are mounted perpendicular to each other, as described above, one of the coil 70 can detect the change of magnetic flux, regardless of the direction in which the agglomerates 20 collide with the protecting tube 51.
  • the fluctuations in magnetic flux inside the coils 70 produce an induced electromotive force e, shown below.
  • N is the number of turns in the coil 70
  • d ⁇ /dt is the fluctuations in magnetic flux per unit of time
  • B is the magnetic flux density in the coil 70
  • 1 is the element length of the coil 70
  • v is the moving velocity of the magnet.
  • the permanent magnets 61 mounted on the detecting rod 60 move and produce an induced electromotive force in proportion to the moving velocity of the permanent magnets 61 in the coils 70. Therefore, it is possible to detect the existence of the agglomerates 20 based on detecting voltage fluctuations in the coils 70.
  • the state of agglomerates 20 formed in the fluidized-bed olefin polymerization reactor container 1 can be detected by fluctuations in the magnetic flux produced in the detecting rod 60. Further, the frequency of collisions by the agglomerates 20 against the protecting tube 51 and the size of agglomerates 20 can be measured by the voltage fluctuations and their period in the coils 70.
  • the induced electromotive force is produced in proportion to the moving velocity of the permanent magnets 61.
  • the end of the detecting rod moves and the magnets move thereby to produce an induced electromotive force which can be measured.
  • the detecting rod 60 is mounted in the side of the fluidized-bed olefin polymerization reactor container 1 at a predetermined height above the distributor plate 2.
  • This predetermined height h (refer to FIG. 2) may be set at a height to enable detection of agglomerates 20 of a size that can fit through the discharge valve 8, for example, ranging from about 5 to about 15 cm.
  • FIG. 6 shows a result of an actual experiment in which the detecting rod 60 was disposed in the fluidized-bed olefin polymerization reactor container 1 and agglomerates 20 were detected.
  • the horizontal axis represents time, while the vertical axis represents voltage fluctuations, that is, the fluctuations in magnetic flux. In normal state, a certain load is applied to the protecting tube 51 by the circulating flow therein.
  • the portion of the graph in FIG. 6 that is stabilized represents the normal state in the fluidized-bed olefin polymerization reactor container 1.
  • the portion of the graph in which the amount of voltage fluctuations increases abruptly represents when the agglomerates 20 collide with the protecting tube 51.
  • powders or agglomerates may not move strictly horizontally, but may move vertically as well.
  • the magnetic flux detecting means are disposed in the vertical direction of the detecting rod 60, as described above, it is still possible to detect vertically moving powders or agglomerates.
  • the protecting tube 51 is inserted at an angle in the range from 20 degrees to 70 degrees in relation to the flow of gas and powders.
  • FIG. 7 is a side cross-sectional view of the detecting rod 60.
  • an apparatus for detecting agglomerates according to the second embodiment is not provided with a protecting tube.
  • the detecting rod 60 is supported with a portion 62 of the detecting rod 60 fixed to the side wall of the fluidized-bed olefin polymerization reactor container 1 and one end projecting freely into the reactor container 1. The other end of the detecting rod is projecting freely into the chamber 55 and magnets are provided on the end thereof.
  • the coils 70 as magnetic flux detecting means are fixedly provided in chamber 55 which is disposed in a body 10, which is fixed at the outside of the wall of the fluidized-bed olefin polymerization reactor container 1.
  • this construction enables the measurement of magnetic flux fluctuations produced by movement of the permanent magnets 61 mounted on the end of the detecting rod 60. Accordingly, it is possible to detect the existence of the agglomerates 20 in the container.
  • magnets mounted on the detecting rod move to generate magnetic flux fluctuation in the coils.
  • Magnetic flux fluctuations produced by movement of magnets enable the detection and measurements of the agglomerates. Since magnetic flux fluctuations are proportional to the moving velocity of the magnets caused by the collision of the agglomerates, it is easy to detect even the collision of small agglomerates. Accordingly, it is possible to improve the sensitivity for detecting agglomerates in the mixed phase container.
  • a distributor plate is provided in the bottom of the mixed phase container to force the gas to circulate in a horizontal direction.
  • the detecting rod positioned at a specified height above the distributor plate enables to control the flow of gas and powders in the mixed phase container and effectively to force agglomerates to collide with the detecting rod. Accordingly, agglomerates can be detected with greater sensitivity.

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  • Organic Chemistry (AREA)
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Claims (9)

  1. Verfahren zur Detektion von Agglomeraten in einem Mischphasenbehälter, in dem eine Mischphase aus Gas und Pulvern gebildet wird, wobei das Verfahren ausweist:
    Anordnen eines Detektionstabs mit einem Ende frei in den Behälter vorstehend und mit dem anderen Ende frei außerhalb des Behälters vorstehend, wobei ein Abschnitt des Detektionstabs an dem Behälter befestigt ist;
    Anbringen eines Magneten am freien Ende des Detektionstabs außerhalb des Behälters, wobei der Magnet beweglich ist; und
    Detektion von Fluktuationen des magnetischen Flusses durch eine Bewegung des Magneten, um eine Existenz der Agglomerate zu messen.
  2. Verfahren nach Anspruch 1, wobei ein Teil des Detektionstabs in ein Schutzrohr eingesetzt wird, das frei in den Behälter vorsteht.
  3. Verfahren nach Anspruch 1 oder 2, wobei eine Verteilerplatte am Boden des Mischphasenbehälters zur Verteilung eines Gases in eine horizontale Richtung angeordnet ist und der Detektionstab in einer vorbestimmten Höhe über der Verteilerplatte angeordnet ist.
  4. Vorrichtung zur Detektion von Agglomeraten in einem Mischphasenbehälter, in dem eine Mischphase aus Gas und Pulvern, wie Produkte des Olefinpolymers und/oder Katalysatoren, gebildet wird, wobei die Vorrichtung aufweist:
    einen Detektionstab mit einem Ende frei in den Behälter vorstehend und mit dem anderen Ende frei außerhalb des Behälter vorstehend, wobei ein Abschnitt des Detektionstabs an dem Behälter befestigt ist;
    einen Magneten, der an dem freien Ende des Detektionstabs angebracht ist und um einen Punkt des Detektionstabs als Hebelstützpunkt beweglich ist; und
    eine Magnetfluß-Detektionseinrichtung zur Detektion von Fluktuationen, die durch eine Bewegung des Magneten erzeugt werden.
  5. Vorrichtung zur Detektion von Agglomeraten nach Anspruch 4, wobei ein Teil des Detektionstabs in ein Schutzrohr eingesetzt ist, das frei in den Behälter vorsteht.
  6. Vorrichtung zur Detektion von Agglomeraten nach Anspruch 4 oder 5, wobei eine Verteilerplatte auf dem Boden des Mischphasenbehälters zur Verteilung eines Gases in eine horizontale Richtung angeordnet ist und der Detektionstab in einer vorbestimmten Höhe über der Verteilerplatte angeordnet ist.
  7. Fließbett-Olefinpolymerisationsreaktor, wobei eine Mischphase aus Gas und Pulvern gebildet wird, wobei der Reaktor eine Vorrichtung zur Detektion von Agglomeraten nach Anspruch 4, 5 oder 6 aufweist.
  8. Olefinpolymerisationsverfahren, das ein Verfahren zur Detektion von Agglomeraten nach Anspruch 1, 2 oder 3 aufweist.
  9. Verfahren zum Herstellen eines Olefinpolymers, das ein Verfahren zur Detektion von Agglomeraten nach Anspruch 1, 2 oder 3 aufweist.
EP00304449A 1999-12-10 2000-05-25 Verfahren und Detektor zur Bestimmung und Messung von Agglomeraten Expired - Lifetime EP1106629B1 (de)

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JP35184499 1999-12-10
JP35184499 1999-12-10

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EP1106629B1 true EP1106629B1 (de) 2004-04-21

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US (2) US6414093B1 (de)
EP (1) EP1106629B1 (de)
KR (1) KR20010066804A (de)
CA (1) CA2311711A1 (de)
DE (1) DE60010022D1 (de)
SG (1) SG93864A1 (de)

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JP3657485B2 (ja) * 1999-12-10 2005-06-08 住友化学株式会社 塊化物検出方法及び塊化物検出装置、並びに該装置を備えた流動床オレフィン重合反応装置及びオレフィンの重合方法
US7634937B2 (en) * 2005-07-01 2009-12-22 Symyx Solutions, Inc. Systems and methods for monitoring solids using mechanical resonator
WO2008016478A2 (en) * 2006-07-31 2008-02-07 Univation Technologies, Llc Method and apparatus for controlling static charge in polyolefin reactors
EP2101908A1 (de) * 2006-11-30 2009-09-23 Westlake Longview Corporation Gasverteilungsplatte für wirbelschichtreaktoren zur olefin-polymerisierung mit strömungs- bzw. drucksensoren zur erkennung von gitterverschmutzung
RU2527945C2 (ru) 2009-01-08 2014-09-10 Юнивейшн Текнолоджиз, Ллк Добавка для процессов полимеризации полиолефинов
WO2010080871A1 (en) 2009-01-08 2010-07-15 Univation Technologies, Llc Additive for gas phase polymerization processes
WO2011017092A1 (en) 2009-07-28 2011-02-10 Univation Technologies, Llc Polymerization process using a supported constrained geometry catalyst
EP2397221B1 (de) 2010-06-17 2017-04-12 Borealis AG Steuerungssystem für einen Gasphasenreaktor, Gasphasenreaktor für katalytische Herstellung von Polyolefinen, Verfahren zur katalytischen Herstellung von Polyolefinen und zur Verwendung des Steuerungssystems
WO2012087560A1 (en) 2010-12-22 2012-06-28 Univation Technologies, Llc Additive for polyolefin polymerization processes

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JPH04361150A (ja) * 1991-06-07 1992-12-14 Sumitomo Chem Co Ltd 塊化物検出装置
JP2722969B2 (ja) 1992-10-26 1998-03-09 住友化学工業株式会社 流動層型反応器のガス分散板
JP3313030B2 (ja) * 1996-07-23 2002-08-12 住友化学工業株式会社 塊化物検出方法及びその装置、並びに該装置を備えた重合槽
JP4004148B2 (ja) 1998-04-06 2007-11-07 株式会社ノーケン 振動式レベル検出装置

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US20020099151A1 (en) 2002-07-25
SG93864A1 (en) 2003-01-21
US6414093B1 (en) 2002-07-02
US6521723B2 (en) 2003-02-18
EP1106629A1 (de) 2001-06-13
KR20010066804A (ko) 2001-07-11
DE60010022D1 (de) 2004-05-27

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